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The RT6245 is a high-performance, synchronous step-down converter that delivers up to 14A output current with an input supply voltage range of 4.5V to 17V. The output voltage can be programmable from 0.4375V to 1.3875V with I<sup>2</sup>C controlled 7-Bits VID. </p>The RT6245 adopts Advanced Constant On-Time (ACOT<sup>®</sup> ) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT<sup>®</sup> operates in nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier. </p>The RT6245A offers automatic PSM that maintains high efficiency during light load operation. </p>The device offers a variety of functions for more design flexibility. The switching frequency, current limit level and V<sub>OUT</sub> slew rate are selectable via I<sup>2</sup>C. Independent enable control input pin and power good indicator are also provided for easy sequence control. Besides, the designers can also command the device to be enabled or shutdown via the I<sup>2</sup>C interface. </p>To control the inrush current during the startup, the device provides a programmable soft start-up by an external capacitor connected to the SS pin. Fully protection features are also integrated in the device including the cycle-by-cycle current limit control, OVP, UVP, input UVLO and OTP. </p>The RT6245 is available in a thermally enhanced VQFN-19L 3.5x3.5 (FC) package.</p>
RT6245 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>VID Control Range via I<sup>2</sup>C Compatible Interface : 0.4375V to 1.3875V in 12.5mV Steps </li><li>4.5V to 17V Input Voltage Range </li><li>14A Output Current Only Support 400kHz </li><li>Integrated 9.8mΩ/4.5mΩ MOSFETs </li><li>Stable with Ceramic Output Capacitor </li><li>ACOT<sup>®</sup> Control for Fast Transient Response </li><li>Selectable Switching Frequency (400kHz/800kHz/1200kHz) </li><li>Adjustable Current Limit Level </li><li>Adjustable Thermal Shutdown Level </li><li>Programmable Soft-Start Time with a Default 2ms </li><li>Monotonic Start-Up into Pre-Biased Outputs </li><li>19-Lead VQFN (FC) Package </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Industrial and Commercial Low Power Systems </li><li>Computer Peripherals </li><li>LCD Monitors and TVs </li><li>Green Electronics/Appliances </li><li>Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs </li></ul></div>
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